Our website is open to the public. It is a closed membership too so users / members need approval but at present I can't see that it gives anything different to a member of the public?
I have a sub-page which I do not want the public to access but only approved users / members. However I cannot see how to apply this chnage simply to the sub-page? As soon as I make the change it applies the change to the whole website.
Please is it possible to make the change simply against the sub-page?
Yes you can change access to an application or a page using the Permissions settings. For content pages there's a Permissions tab you can go to for each page.
For content pages this can only be done with top level sub-pages. Any pages you create as sub-pages of sub-pages will take their permission from the top sub-page. (if that makes any sense!)
In the standard site setup, Read permission is granted to The Public and is inherited down to every item on your site. To remove this from a page/application then you can go to the appropriate permission tab, click the "Do not inherit permissions..." button, then alter the permissions explicitly for that page.